John h



l. H. BELL.

TELEGRAPH SYSTEM.

APPUCATION FILED'NOV- 2|. 191T- 1,403,833, Patented Jan. 17,1922.

UNITED STATES PATENT FFECE.

JOHN H. BELL, OF SOUTH ORANGE, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATIGN 02 NEW YORK.

TELEGRAPH SYSTEM.

To all whom it may concern:

Be it known that I, JOHN H. BELL, a citizen of the United States, residing at South Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Telegraph Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telegraph systems and more particularly to telegraph repeater systems.

The principal object of this invention is to provide an improved organization of apparatus to more reliably and efficiently handle the work of repeating telegraphic signals.

'A further object of this invention is to employ an arrangement ofv equipment to minimize the number of mechanically moving parts and to establish a reforming or regeneration of repeated impulses, to render such currents free from mutilations or any distortion of their form which may have taken place'in the originating impulses during their transmission.

In carrying out the present invention there are provided impulse receiving means, current distributor means, and electrostatic current receptor or storage'means combined to effect the translation of current changes from one line section into another line section.

This invention is illustrated diagrammatically in the accompanying drawing, in which only so much of a telegraphic equipment is shown as will be necessary to a clear understanding of the present system.

The apparatus shown in the drawing may be considered as located at a repeater station from which a first and a second line section respectively indicated by the reference numerals 1 and 21, extend to distant telegraph stations (not shown). The equipment located at the point A serves for repeating signals from the line 1 to the line 21, while the equipment at B serves for repeating signals from the line 21 to the line 1.

Telegraphic impulses from the distant station on the line 1 traverse the windings of a polarized relay 2 and an artificial line AL to earth. In the present embodiment of this invention the double current method of transmission has been employed; therefore, under changes of polarity in the line 1, the armature of the relay 2 will be correspondingly biased to engage one or the other of its oppositely positioned contacts, thereby con- Specification of Letters Patent. Patenfggfl Ja 1'7, 1922,

Application filed November 21, 1917.

Serial No. 203,084.

necting either a source of negatively poled current 3 or a positively poled source of current a with a collector ring 5 of a distributor C. The distributor C, as shown, is a developed view of a distributor which should preferably be of a rotary type. A first trailer brush or contactor arm 6 is adapted to travel from right to leftin advance of a second trailer arm 7. The first brush joins the collector ring 5 with asegmented path 9, and since suitable synchronizing equipment (not shown) is employed for maintaining a synchronous relation between the incoming impulses from the line 1 and the travel of the brushes 6 and 7, the brush 6 will be over a segment, common to eitherone or the other of two condensers 10 and 11, at an instant an impulse from the line 1 arrives through the relay 2. The brushes 6 and 7 may therefore be considered respectively, as a receiving control and a transmitting control. For the purpose of illustration, let it be assumed that an impulse of negative current arrives from the line 1 at the instant the brush 6 is over a segment 12. The armature of the relay 2 will accordingly be biased to connect with the negative battery 3, and current therefrom will traverse the collector ring 5, brush 6 and segment 12, to charge the condenser 10. If, following this operation, a positive impulse of current arrives from the line 1 at the instant the brush 6 is over a segment 13, the armature of the relay 2 will be moved to connect the source of positively poled current 1 over the distributor circuits already traced to charge the condenser 11. The brush 7 following the brush 6 on arriving over the segment 12 establishes a circuit therefrom to a second collector ring 8 connected thence through an adjustable resistance 14 and the winding of a polarized relay 15 to earth. The condenser 10 will therefore discharge over this circuit to bias the armature of the relay 15 to engage its contact stop, whereby a source of negatively poled current 16 will be connected over a conductor 18 with the apex or neutral connective point of the duplexed line 21. From this point the current divides, one portion traversing the right-hand coil of a polarized relay 19 and an artificial line All to earth, while the remainder traverses the left-hand coil of the relay and the line circuit 11 to an earth connection at a distant station. As wellunderstood in the art, the branching of this rebe-clear that as the brush 6 sweeps through its path,'the condensers 10 and 11 will be alternately charged by currents corresponding-in polarity with'the polarity of incom-' ing impulses from the line 1 at instants the distributor brush 6 is over segments connected respectively common to these condensers. It will'befurther obvious that in following the brush 6, the brush 7, as it passes overthe segments respectively common to the condensers 10 and 11, Wlll successively discharge these condensers to work 'the relay 15 for transmitting regenerated and correspondingly poled impulses of current to the line 21.

For translating impulses from the line 21 into thedin'e 1, the relay 19 works changes of current potentials to a distributor D, which in turn controls the operation of a relay 20 to include regenerated changes of current polarities over a conductor 22 with the outgoing or neutral point of the duplexed line 1. Since the equipment employed for repeating in the latter direction is typicalof the equipment employed and already described for repeating'signals from the line 1 to the line 21, further consideration of the equipmentat B will therefore not be' necessary.

From the foregoing description it will be clear that the armatures of the relays and the'brushes of the distributors are the only mechanically moving parts employed in this two-way repeater system. It may also be'pointed'out that the capacity of the condenserslO and 11 and the value of the variable resistance 14: may be so proportioned with respect to the potential of the batteries 3 and '4; and the speed of transmission that the action of the condenser dis charges through the relay 15 will be such as to best'meet the resonant or electrical constants of the circuit. Such tuning of the circuits will insure that in its operations the armature of the translating relay 15 will be held in firm engagement with-its contact stops for a sufficient period to insurethat impulses repeated to the line 21 will be regenerated to a predetermined length irrespective of any mutilated condition of the originating impulses received from the line 1. Such regeneration'of impulses will of course be reciprocally efi'ected by the corresponding devices in repeating telegraphic impulses from the line section 21 to the line section 1.

lVhat is claimed is:

1. In a telegraphrepeatersystem, a plurality of :lines, sources of current, impulse receiving means, distributing means, and electrostatic means jointly controlled by said impulse receiving means and said distributing means toempl oy said sources of current in repeating signals between said lines. I

2.- In a'telegraph repeater system, a plurality or" lines, sources of current, a plurality of relays, current distributors, and condensers conditioned'by said distributors to be charged through control of one of said relays and to be discharged to control another one of said relays in employing said sources of current'to repeat telegraphic signals between said lines.

telegraphy, a plurality of line sections,

sourcesol current, receiving relays, transmitting relays, condensers, and distributor means for connecting said condensers to be charged through control by said receiving relays and to discharge through saidtransmitting relays in repeating signals between said lines.

4. In a telegraph repeater system, a plurality of line sections, a condenser, a'relay energized by an impulsein said line to charge said condenser, a rotary distributor V for discharging said condenser, and a relay controlled by the discharge of said condenser to repeat an impulse of current into a second 1 line section.

'5. In a telegraph repeater system, a first line section, a. plurality of condensers, means controlled by impulses in said line to suecessively charge said condensers, a second line section, means to successively discharge said condensers, and means controlled by the discharge of said condensers to establish impulses in saidsecondline section.

6. In a telegraph repeater, a source of current, a condenser, a receiving relay to include said source of current to charge said condenser, a transmitting relay to control said source of current, and means for dis-' Jcharging said condenser to operate said transmitting relay.

7. In telegraph repeater, sources of current, a receiving relay and a transmitting relay, a distributor, condensers for saiddistributor, means operated by said distributor and said receiving relay to connect said condensers to be charged by said sources of current, and further means controlled by said distributor to discharge said condensers to operate said transmitting relay.

'8. In a telegraph repeater, sources of current, a distributor, a plurality ofcontactor points on said distributor, a condenser connected common to alternate ones of said cont actor points, a second condenser connected to the other alternate ones of said contactor points, a receiving relay, means operated by said distributor to complete circuits under the control of said receiving relay to successively charge said condensers from said sources of current, a transmitting relay to control circuits from said sources of current, and means controlled by said distributor for successively discharging said condensers to control the operation of said transmitting relay.

9. In a repeater for multiplexed telegraph lines, a first and a second line, a receiving relay for said first line, a transmitting relay for said second line, a distributor comprising a receiving and a sending control, sources of current Worked by said receiving and sending relays, and condensers charged by the joint work of said receiving relay and the receiving control of said distributor and subsequently discharged by the sending control of said distributor to operate the sending relay.

10. In a repeater system, a plurality of line sections, a repeating station, means thereat responsive to impulses received from one of said line sections, distributing means associated therewith comprising segments, alternate ones of which are connected in different groups, condensers associated with said distributing means for storing impulses,

and means for releasing the stored impulses for repeating corresponding impulses into a second line section.

11. In a telegraph system, a line divided into a plurality of sections, a distributor interposed between adj acent sections thereof, and having its alternate segments connected in different groups, means responsive to cur rent impulses received from one of said line sections, means individual to each of the groups of segments for storing impulses according to the operation of said means, and means controlled by said stored impulses for repeating corresponding impulses into a second line section.

12. In a telegraph system, a line divided into a plurality of sections, a distributor interposed between adjacent sections thereof and having its alternate segments connected in different groups, means responsive to current impulses received from one of said line sections, means associated with each group of segments for storing impulses according to the operation of said means, means for releasing the stored impulses, and means controlled by the released impulses for repeating corresponding impulses to a second line section.

In witness whereof, I hereunto subscribe my name this 16th day of November, A. D.

JOHN H. BELL. 

